From: Oliver Hartkopp <socketcan@hartkopp.net>
To: Eric Dumazet <eric.dumazet@gmail.com>,
Dong Aisheng <b29396@freescale.com>
Cc: linux-can@vger.kernel.org, mkl@pengutronix.de, wg@grandegger.com,
varkabhadram@gmail.com, netdev@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH V3 1/3] can: add can_is_canfd_skb() API
Date: Wed, 05 Nov 2014 18:33:09 +0100 [thread overview]
Message-ID: <545A5F55.7050307@hartkopp.net> (raw)
In-Reply-To: <1415204533.13896.7.camel@edumazet-glaptop2.roam.corp.google.com>
On 05.11.2014 17:22, Eric Dumazet wrote:
> On Wed, 2014-11-05 at 21:16 +0800, Dong Aisheng wrote:
>
> This looks a bit strange to assume that skb->len == magical_value is CAN
> FD. A comment would be nice.
>
Yes. Due to exactly two types of struct can(fd)_frame which can be contained
in a skb the skbs are distinguished by the length which can be either CAN_MTU
or CANFD_MTU.
>> +static inline int can_is_canfd_skb(struct sk_buff *skb)
>
> static inline bool can_is_canfd_skb(const struct sk_buff *skb)
>
ok.
>> +{
What about:
/* the CAN specific type of skb is identified by its data length */
>> + return skb->len == CANFD_MTU;
>> +}
>> +
>> /* get data length from can_dlc with sanitized can_dlc */
>> u8 can_dlc2len(u8 can_dlc);
Regards,
Oliver
next prev parent reply other threads:[~2014-11-05 17:33 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-05 13:16 [PATCH V3 1/3] can: add can_is_canfd_skb() API Dong Aisheng
2014-11-05 13:16 ` [PATCH V3 2/3] can: m_can: update to support CAN FD features Dong Aisheng
2014-11-05 14:31 ` Marc Kleine-Budde
2014-11-05 14:42 ` Oliver Hartkopp
2014-11-05 13:16 ` [PATCH V3 3/3] can: m_can: workaround for transmit data less than 4 bytes Dong Aisheng
2014-11-05 14:29 ` Marc Kleine-Budde
2014-11-05 18:15 ` M_CAN message RAM initialization AppNote - was: " Oliver Hartkopp
2014-11-06 1:57 ` Dong Aisheng
2014-11-06 7:04 ` Oliver Hartkopp
2014-11-06 8:09 ` Dong Aisheng
2014-11-06 12:33 ` Oliver Hartkopp
2014-11-06 12:47 ` Marc Kleine-Budde
[not found] ` <545BA039.7080108@hartkopp.net>
2014-11-07 8:15 ` Dong Aisheng
2015-02-05 19:04 ` new M_CAN IP rev 3.2.x documentation available - was: Re: M_CAN message RAM initialization AppNote Oliver Hartkopp
2014-11-07 8:40 ` M_CAN message RAM initialization AppNote - was: Re: [PATCH V3 3/3] can: m_can: workaround for transmit data less than 4 bytes Dong Aisheng
2014-11-07 8:34 ` Dong Aisheng
2014-11-06 9:00 ` Marc Kleine-Budde
2014-11-05 16:22 ` [PATCH V3 1/3] can: add can_is_canfd_skb() API Eric Dumazet
2014-11-05 17:33 ` Oliver Hartkopp [this message]
2014-11-06 1:52 ` Dong Aisheng
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